دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the part of a groove on the drawworks drum that changes direction. Grooves run parallel to each other, except in the angle-control section, where each groove is machined at a slight angle. This angled part of the groove causes the wire rope being spooled onto the drum to change direction so that the next wrap of rope on the drum lies in between the wraps of rope already on the drum. Also called a crossover section.

n: a casing sub containing a seal bore and a left-handed thread;it is run as a crossover sub between casing sizes and to provide a tubing anchor.

n: the place at each end of the drawworks drum where the drilling line being spooled onto or off of the drum stops moving in one direction and starts moving in the other direction. Also called turn back. crossover joint n: a length of casing with one thread on the field end and a different thread in the coupling, used to make a changeover from one thread to anod1er in a string of casing.

n: A sub that is used to connect drill string components that have different threads or sizes.

a section of the treating string that transfers incoming flow from inside the pipe to the annulus below the crossover, and the return flow from inside the tubing to the annulus above the crossover. Straddles a packer.

n: See crossover.

n: see angle-control section.

n: a sub that allows different sizes and types of drill pipe to be joined.

n: See adapter.

a short section of pipe with the proper threads cut into each end to join two pieces of pipe or equipment that do not have matching connections.

n: the crossover flange having two bridge pieces of screw join,and they situated

direct crossover valve.